Malicious PDF — malware analysis report

Static analysis result for SHA-256 205a087d78e3df9a…

MALICIOUS

PDF

78.7 KB Created: 2021-04-01 14:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3090dd8fe317925fc1f9f005b95021 SHA-1: a05f50ffef20755e6ac9d8eb276adb88dbcbece2 SHA-256: 205a087d78e3df9a8084b3c15dbeee33eccc1e11c821a1a9023a3e3aee729642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external links, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF heuristics point towards a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=guide+words+practice+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6061647c857ee.pdf
    • https://cdn-cms.f-static.net/uploads/4504788/normal_6052fec557953.pdf
    • http://creditscorefix.info/what_is_the_plot_of_prince_caspian1fpdp.pdf
    • https://cdn-cms.f-static.net/uploads/4446174/normal_604b4a540d044.pdf
    • http://ampinternational.org/kuxovagumelarilivasigut51yqr.pdf
    • http://labincom-med.ru/information_security_analyst_jobs_salaryx5rgm.pdf
    • https://cdn-cms.f-static.net/uploads/4506131/normal_60232c70dbb7b.pdf
    • http://frankiearvelo.com/334007278821n3vq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://seguwogira.rf.gd/fawimebonepapanalefefuru.pdf
    • https://s3.amazonaws.com/xeponodij/kejamifivotusi.pdf
    • https://s3.amazonaws.com/lupuvogotog/86994064324.pdf
    • https://s3.amazonaws.com/dorobukasawituw/vuwodigegufirikul.pdf
    • http://rerumixididepu.rf.gd/zosijasitadiguwe.pdf
    • https://s3.amazonaws.com/padosumifubobo/ashok_chakra_hd_wallpaper.pdf
    • https://s3.amazonaws.com/wexoteluwag/how_to_export_blender_for_3d_printing.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_7251b4a2d57540678eccd5c7686fc1a4.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_77ca5720a2404fc18bbc03161a4216ac.pdf?index=true
    • https://s3.amazonaws.com/kubedukowug/95356892516.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_95fa2e659c5f46cd92089f0ff31d4a2c.pdf?index=true
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_97bc6ae1baa4410988c1a08c28d1a627.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f542.bin
64bbb9941cd061574b69362d0eb08bc6de8355a3e7e506a4c761e9ca5107f10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 5400 bytes
font_01_sfnt_off000107b4.bin
857a39d50061921362e00daef3f48e1ad2b380088a6b451bfb278ba452d301a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10572 bytes

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